evans



(N o Mo d 61?) W. R. EVANS. DENTAL BASE PLATE- 3 No. 606,198. Patented June28, 1898.

FIG. 1-

WITNESS-ES: INVENTOR:

K I am NITED STATES PATENT OFFICE.

W'ARREN-It. EVANS, OF PORTLAND, MAINE, ASSIGNOR TO THE S. WHITE DENTAL MANUFACTURING COMPANY, OF PHILADELPHIA,

PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 606,198, dated June 28, 1898.

Application filed January 11, 1898. Serial No. 666,294. (No model.)

To all whom it may concern.-

Be it known that I, WARREN R. EVANS, a citizen of the United States, residing in Portland, in the county of Cumberland and State of Maine, have invented certain new, and useful Improvements in Dental Base Plates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to wax products for use by dentists for making base ortrial plates; and my object is to improve that class of such products which is composite or com-posed of different kinds of materials united to form a single sheet.

To this end my invention consists of a com- I posite sheet or plate of wax and cloth, as will be hereinafter more particularly explained, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of an upper base or trial plate made of my improved composite iwax product. Fig. 2 is an enlarged cross-sectional View of the same on the line 2 2 of Fig. 1. Fig. 3 is a View, partly in perspective and partly in vertical section, of a small'pieoe of my improved composite product enlarged many times to clearly show the reticular texture of the textile element thereof.

The improved base-plate product consists of a composite sheet of waxA and textile fabrib B, the two elements being united in any suitable way. For the wax element I prefer" to use a sheet of beeswax prepared as usual for dental base-plate uses, although I may employ a compound of beeswax and paraffin, or beeswax, paraffin, and gutta-percha; or, in fact, any well-known or suitable base-plate material may be employed that is capable of being warmed to render it pliable and conformable to an irregular surface like that of a plaster model of a human denture. I have found that cheese-cloth serves well for the cloth or textile element; but it should be understood that linen, cotton, muslin, and similar fabrics will answer the same purpose. The wax and cloth may be united to form the improved composite sheet in any suitable manner. One method of uniting the before-n1en tioned elements to form the composite sheet is to place a sheet of wax or wax compound of the proper thickness upon a smooth hard slab and then place a piece of cheese-cloth or other suitable fabric upon the sheet of wax and pass a warm roller over the fabric until the wax is caused to partly fill the interstices of the cloth and the two firmly united to form asingle composite sheet of Wax and cloth. The sheet so formed may then be cut into smaller sheets of the requisite size to form a new article of manufacture for the use of dentists, who may cut and trim the sheets to the proper size and shape for making base or.

trial plates.

In making a base-plate from my improved composite sheet it is essential that the cloth side of the sheet be placed next to the plaster model, whereby when the base-plate is placed in the mouth the said clothside of the plate will come in contact with the gums or mucous membrane.

The chief advantages of my improved composite sheet are that while it is capable of be-' ing rendered pliable by heat, so that it may be conformed to an irregular surface like that of a toothless-mouth model, it is capable, when cooled, of retaining the imparted configuration without the risk of fracture in manipulation incident to the use of common beeswax or wax-compound base-plates and that the cloth does not adhere to the plaster model as does the ordinary waxor wax-compound plate, and on the other hand the absorbent nature of the cloth surface provides an effective adhesive contact with the gums, whereas the smooth impermeable surface of the said ordinary wax trial-plates renders them slippery and diff cult of retention when placed in contact with the moist gums.

If desired, the fabric element of my improved composite productmay be sterilized or rendered asceptic in any suitable wellknown Way either before or after it has been united to the wax element. In fact, the wellknown surgeons gauze may well be employed in the manufacture of my improved product.

I claim as my invention 1. A new product for making base or trial plates for use by dentists, consisting of asheet on the side of the plate which is to come in of Wax and a sheet of cloth, the two being contact with the gums, substantially as and united to form a composite sheet of wax and for the purpose hereinbefore set forth.

cloth, the cloth being on the side of the sheet In testimony whereof I affix my signature 5 which is to come in contact with a plaster in presence of two Witnesses.

model and subsequently with the PHIIIS in a human mouth, substantially as arid for the WARREN EVANS purpose set forth. Witnesses:

2. A dental base or trial plate consisting of JOSIAH II. DRUMMOND, J r.,.

IO wax and cloth firmly united, the 010th being FREDERICK E. LEIGHTON. 

